provide installation and maintenance instructions for System Sensor photoelectric smoke detectors models 2W-B, 2WT-B, 4W-B, 4WT-B Series
This document provides installation and maintenance instructions for System Sensor’s 2-wire and 4-wire photoelectric smoke detectors. It includes details on detector features, wiring, mounting, and LED status indicators. The detectors are designed for open area protection and must be used with compatible UL-listed control panels. Regular maintenance and cleaning are required to ensure proper function, with annual cleaning recommended.
The detectors feature advanced optical sensing chambers and microprocessors that automatically reset sensitivity after contamination. Models 2WT-B and 4WT-B include built-in thermal sensors and freeze detection. Installation is simplified with pre-wired mounting bases compatible with drywall fasteners. LED indicators show status: green for normal, red for maintenance or alarm, and blinking patterns during power-up.
| System Voltage | 12/24 Volts Non-polarized |
|---|---|
| Operating Temperature Range | 2W-B and 4W-B: 32 to 120°F (0 to 49°C); 2WT-B and 4WT-B: 32 to 100°F (0 to 37.8°C) |
| Operating Humidity Range | 0 to 95% RH non-condensing |
| Diameter (including base) | 5.3 inches |
| Height (including base) | 2.0 inches |
| Weight | 6.3 oz. |
| Heat Sensor (Models 2WT-B and 4WT-B) | 135°F (57.2°C) |
| Freeze Trouble (Models 2WT-B and 4WT-B) | 41°F (5°C) |
| Max. Alarm Current (12V) | 130 mA |
2W-B and 4W-B models operate from 32 to 120°F (0 to 49°C); 2WT-B and 4WT-B models operate from 32 to 100°F (0 to 37.8°C).
Cleaning should be performed annually, as required by NFPA 72.
The red LED latches on solid when the detector is in alarm mode.
No, the chamber must never be opened while power is applied to prevent automatic sensitivity reset.